Transpose the PRO FORMANCE

1. Locate the Transpose Selector.
2. Rotate the knob clockwise to transpose up in semitone steps (C# to B) or 1-2 octaves.
3. Rotate the knob counter-clockwise to transpose down in semitone steps (B to C#) or 1-2 octaves.
4. Set straight up to C for no transposition.

Source: PROformance Plus — emu-proformance-om (manual)